Operation Procedure - Mitsubishi Electric PKA-A12HA Service Manual

OPERATION PROCEDURE

3. REMOVING THE INDOOR CONTROLLER BOARD
AND WIRELESS CONTROLLER BOARD
(1) Remove the front panel. (Refer to 2.)
(2) Remove the room temp. thermistor TH1. (see Photo 3)
(3) Remove the electrical box covers (screw 4 × 12).
(See Photo 3)
(4) Disconnect the connectors on the indoor controller board.
(5) Remove the switch board cover.
(6) Pull out the indoor controller board toward you, then
disconnect the rest of connectors.
Remove the indoor controller board and switch board.
(7) Remove the holder of wireless controller board.
(8) Disconnect the connector of wireless controller board and
remove the wireless controller board from the holder.
Screw of electrical box
Photo 5
side cover & clamp
(45)
Clamp
4. REMOVING THE ELECTRICAL BOX
(1) Remove the front panel. (Refer to 2.)
(2) Remove the electrical box covers. (See Photo 3)
(3) Remove the nozzle assembly. (Refer to 5.)
(4) Disconnect the connecting wire from terminal block (TB4)
and terminal block for MA-remote controller (TB5, only
PKA-A·HA).
(5) Disconnect the connectors on the indoor controller board.
(6) Disconnect the connector for the ground wire. (See Photo 6)
(7) Pull the disconnected lead wire out from the electrical box.
(8) Remove the screw of electrical box. (See Photo 7)
(9) Push up the upper fixture (See Photo 6) catch to remove
the box, then pull the right fixture (See Photo 4) and
remove it from the box fixture.
Room temp.
thermistor (TH1)
Electrical box
side cover
Caution:
In the case that room temp. thermistor is
fixed with the screw of electrical box side
cover, keep 45mm (1-3/4 inch) between
the bottom end of clamp and the top of
room temp. thermistor as Photo 5.
Photo 3
Screw (top cover)
Nozzle assembly
Photo 4
Terminal
block (TB4)
Photo 6
Connector for
ground wire
Photo 7
31 31
PHOTOS
Electrical box cover (top) Electrical box
Screw (side cover)
cover (side)
Switch board cover Holder of wireless
controller board
Indoor controller board (I.B)
Terminal
block (TB4)
Terminal
block (TB5)
Screw
(Electrical box)
Room temp.
thermistor
(TH1)
Screw
(side
cover)
Fixture
(right)
Fixture
(upper)